J1784 Backshells for 38999-Type Connectors
Straight and 90° · cable clamp 2.49–21.67 mm · 360° shield termination
Protective Caps for 38999-Type Plugs and Receptacles
Plug and receptacle caps · shells 8–25 · chain, cable or cord lanyard
Protective caps keep dirt, water and damage off unmated plugs and receptacles. Caps are made for GJB 599 Series I, II and III and the J599WR series, in the same shell materials and finishes as the connectors, with a chain, stainless cable or nylon cord so the cap stays with the connector.
- Fits
- GJB 599 Series I, II, III; J599WR
- Shell sizes
- 8 to 25
- Materials
- Aluminum, stainless steel, composite
- Lanyard
- Metal chain, stainless cable, nylon cord
Key features
- Plug caps and receptacle caps for every shell size
- Same materials and finishes as the connector shell
- Plug caps keyed to match the receptacle key position (N or A–D)
- Lanyard with fixing tab or ring, or without lanyard
- Ordered separately from the connectors
Specifications
| Parameter | Value | Condition |
|---|---|---|
| Finishes | F aluminum nickel, W aluminum olive-drab cadmium, S stainless nickel, K stainless passivated, M composite nickel, J composite olive-drab cadmium | |
| Lanyard | R stainless cable with tab, N stainless cable with ring, S steel wire rope with tab, J nylon cord with tab | |
| Lanyard length | 155–200 mm | by shell size |
| Parameter | Value | Condition |
|---|---|---|
| Finishes | F electroless nickel, B olive-drab cadmium, E stainless passivated | |
| Lanyard | A none, C metal chain with tab, N metal chain with large ring (receptacle caps), R nylon cord with tab, S stainless wire rope with tab | |
| Key positions (plug caps) | N, A, B, C, D | smallest shell: N, A, D |
| Parameter | Value | Condition |
|---|---|---|
| Finish | T aluminum, nickel-fluorocarbon polymer | |
| Lanyard | R, S, J with tab; N with ring |
Values not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing. Specifications are subject to change; contact us for the current datasheet.
Series III cap dimensions
| Shell | Plug cap Ø A (mm) | Plug cap lanyard L (mm) | Receptacle cap Ø A (mm) | Receptacle cap lanyard L (mm) |
|---|---|---|---|---|
| 9 | 21.4 | 160 | 23 | 155 |
| 11 | 24.5 | 180 | 28 | 170 |
| 13 | 29 | 180 | 31 | 170 |
| 15 | 32 | 180 | 32 | 170 |
| 17 | 35.2 | 180 | 37 | 170 |
| 19 | 38.2 | 200 | 39 | 190 |
| 21 | 41.2 | 200 | 42 | 190 |
| 23 | 44.4 | 200 | 45 | 190 |
| 25 | 48 | 200 | 49 | 190 |
Lanyard lengths can be changed on request.
How to order
J599/[32 plug cap | 33 receptacle cap][finish][shell][lanyard]
Example: J599/32F09R — Series III plug cap, aluminum with nickel, shell 9, stainless cable with fixing tab
| Code segment | Options |
|---|---|
| Cap type | |
| Finish | |
| Shell | |
| Lanyard |
Series I caps: JY27501 (plug) / JY27502 (receptacle) + finish + shell + lanyard + key, for example JY27501F11CN.
Series II caps: JY27510 (plug) / JY27511 (receptacle), shells 08 to 24.
J599WR caps: J599WR/32 or /33 + T + shell + lanyard, for example J599WR/33T15N.
Typical applications
- Rail vehicles and signalling
- Marine and offshore equipment
- Industrial automation
- Test and measurement systems
Frequently asked questions
Are caps supplied with the connectors?
No — caps are ordered separately. Add the cap part number to your inquiry, or tell us the connector part numbers and we will list the matching caps.
Can I get a longer lanyard or a different fixing?
Yes. Lanyard length, material and fixing tab or ring can be adapted to your panel.
From sample to production
Send your requirement
Part number, drawing, pin-out or a short description of your application.
Configuration and quote
Our engineers match the configuration and reply with a drawing and quotation.
Samples
Samples are made to your order. Third-party testing to your specification is available on request.
Your approval
You test the samples in your own equipment and approve them.
Series production
Production follows the approved sample configuration.
Need a quote or a drawing?
Send your part number, pin-out or drawing. An engineer will reply by email.
Related series
J599 Series III Circular Connectors (38999 Series III Type)
38999 Series III type · shell sizes 9–25 · 184 insert arrangements
J599WR Marine-Grade 38999 Circular Connectors, Cadmium-Free
Cadmium-free nickel-PTFE finish · marine-grade · up to 5000 mating cycles
GJB599 Series I Bayonet Circular Connectors (38999 Series I Type)
38999 Series I type · bayonet coupling · 127 insert arrangements